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The `pop()` method in JavaScript is the "opposite sibling" of `push()`.
It **removes the last element of the array** and **returns its value**.

---

## Example:

```javascript
const fruits = ["apple", "banana", "cherry"];
const last = fruits.pop();

console.log(last);   // "cherry", the removed element
console.log(fruits); // ["apple", "banana"]
```

- `pop()` **mutates the original array**.
- It returns the **removed element**, not the length.
- If the array is empty, it returns `undefined`.

---

## Example with an empty array:

```javascript
const arr = [];
const removed = arr.pop();

console.log(removed); // undefined
console.log(arr);     // []
```

---

## How it works:

- Removes the element at **index** `length - 1`.
- Decreases `length` by 1.
- Returns the value of that element.

---

## Comparison with `push()`

| Method | What it does | Returns | Changes the array |
|---|---|---|---|
| `push()` | Adds to the **end** | The new length | Yes |
| `pop()` | Removes from the **end** | The removed element | Yes |

---

## Example of using them together:

```javascript
const stack = [];

stack.push("a");
stack.push("b");
stack.push("c");

console.log(stack); // ["a", "b", "c"]

console.log(stack.pop()); // "c"
console.log(stack.pop()); // "b"
console.log(stack);       // ["a"]
```

`push()` and `pop()` are often used together to implement a **stack**: a "last in, first out" (LIFO) data structure.

---

## In short:

| Action | Description |
|---|---|
| `arr.pop()` | Removes the last element |
| Returns | The removed element |
| Changes the array | Yes |
| On an empty array | Returns `undefined` |

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